Gas turbine plant



` Dec. `194451. w TRAUPEL 2,268,270 'l "GAs TURBINE PLANT l Filed. Nov r), 19:59

Emu/Ummmxw intotwo gasheaters. r i

AmOns the advantages which spinnt of this` l'atented` Dec.l 30, 1941 es PAT i zum ENTOFHCE i lWamel? 'ri-super; "saitxerisna ui l f `signor Sulzer Frres, Societe Ancnyme.

WInterthnrf-Switaerland I l The invention relates to a1 gas turbine plant I consisting of a compressor in which ythe oxygeneontaining. gaseous working medium `is "ccmpressed,` a gas heater in which the compressed `gas isheated by heat exchange,a` `turbine `in l which the compressed, heated gas expands, l means for leading backinto the said compressor the gas expanded. in theturbine, an auxiliary compressor which compresses air and supplies it Q v to the compressorpmeans for driving theauxiliarycompressor, and a conduit through which 1a l Aportion of thegas expanded in the turbine isled f into the combustion chamber ofgthe gas heater in order to serve as combustion air. That portion of the gas which after expansion more turbine auxiliary compressor.

is led back again into the compressonaccordingly describes a cycle and this cycle takes place completely under overpressure, `In the conduit sys- ,-tem, `through which the` sasis led back into the compressor, there is provided 'aycooler in which itis cooled to the lowest temperature possible.

l That portion ofthe gas which, after expansionin `the turbine passes into thecombustion chamber I of the'gasheater,` consequently also has a presf sure higher than i atmospheric'` pressure so jthat very favorable conditions for the combustion and the heat exchange result. I

Appropriately the combustion gas leaving the gas heater is led into an auxiliary turbine `which drives the `said auxiliary compressor. To in.

crease the ehlciency of the plant it is further- M more" advisable to lead the gas expanded in `the turbine, which is led back `into the compressor,

through a heat exchanger in which it gives oi't` a portion `of its `heat to the sas which hows from no combustion regulationoff outputcan be ehected advantageously'by change of` the pressure level in the cycle bylsuitable regulation ofthe speedof the Theysingle hgure of the accompanying `drawing illustrates vmore lor less `diitgrammatically. an arrangement of apparatus embodying the invention. w "Turbo-compressor I/ i compresses 'the `gaseous working` medium which hows `through pipes 2 and I. The compression is `efi'ected with :intermediate coolinspior whichz a cooler 4 having a I 'cooling coil I `is provided. The compressed working `gas `containing oxygen passes then to pipe i 20F and afterwards 1 through heat-exchanger i l, where it is warmed by the exhaust heat, into pipe. system 20 of gas heater 22,.in order to be heated up to the necessary maximum .temperature. The heated gaseous `working medium hows through pipe .IIl into the highepressux-'e turbine 'If 5 lwhichdrives the compressor I. 'Through pipe l2 the. partly expanded working medium is led into 1 the pipe system` 2| of :the `gas `heater 22'and, again in1areheatedstate,xis conductedby; conthe compressor to thegas heater. In the same way also the combustion gas, which hows from the gas heater tothe auxiliaryturbinemayrbe led through a :heat exchanger where it givesioii' heat tothe air coming from the compressor.` `A further means for improving the ehlciency includes a `high pressure and a` low pressure turbine, and in heatingithe gas howing from the high pressure turbine to the lowpressure turbine inthe gas heaterbyheat exchange.

It is evident that,` especially inthe case of large plants, the individual parte of the plant can be divided into several units, for example,

kind possesses, the following fare to be named particularly. `As the combustion is `carried out `under pressure, the conditions in the gas heater are soiavorabla that combustion chamber and heat exchange surfaces become very smallf The u duit l2 `to the low-pressure turbine 2 which drives the generator I9.` The turbines 1 and!` wherein the working medium expands comprise a turbine system. `The gas containing oxygen and issuing from the low-pressure turbine has still a pressure above `atmospheric and hows through pipe 2 and heat-exchanger B and cooler II back again into compressor I. In the heat-exchanger 5 the returning working medium gives up a part of its heat in countercurrent to the compressed working medium coming from blower I through pipe 30. In the cooler I I the working medium is then fully cooled by meansof the pipe system 2l, the cooling medium to the cooler entering through pipe 25. After being cooled down the gas is again led into blower I. I l

` At 23 a part ofthe gas istaken from the working cycle through the pipe 34 inyorder to serve as combustion air in the sas heater. The

combustion gases produced in the combustion space of gas heater 22 pas/s' into the auxiliary turbine Il through pipe ",a hlter 2l and heatexchanger l. This auxiliary turbine I! is con-` n sequently l the only part `of the whole plant through which the combustion gases how, since the combustion gases do not come into contact with the other machines. For this reason it is possible towork the plant also with fuels which turbo-compressor.

form ny coke and fly ash, since it is possible sumciently to cool and to filter this small part of the gas beforey it enters auxiliary turbine I4.

In order to replace the quantity of gas removed Y through pipe 34an additional quantity of air led in through pipe 36 is compressed by means o! the auxiliary compressor I and introduced through pipe `3 and cooler` I8 intov the working cycle. Cooler I6 nas a coil I6 through which a' cooling medium flows as shown by the arrows.

I claim: x x v 1. A gas turbine plant which comprises a turbo-compressor for compressing a working gas, a turbine system in which theworkingr gas is expanded arranged to drive the compressor and another load, a lconduit for' passing the compressed working gas fromthe turbo-compressor to the turbine system, a pipe connecting the turbine system With the turbo-compressor for passing the working gas expanded in the turbine system back to the turbo-compressonmeans for cooling the working gas passing from the turbine system through the pipe, anauxiliary turbine, an auxiliary compressor connected to and :driven by the auxiliary turbine, a combustion heating means,` a branch pipe connecting the turbine system to the combustion heating means `whereby a part of `theexpanded working gas from the trbinesystem is used for combustion, i means for passing the combustion gas in heat exchange relation with gas lpassing through` the conduit* from the turbo-compressor to the turbine system, means for passing ,the combustion gas to the auxiliary turbine to drive the auxiliary turbine, means for discharging the combustion gas `used to drive the auxiliary turbine to the atmosphere, .means for passing air from the i atmosphere into the auxiliary compressor, and `means for cooling the airrcompressedv in the auxiliary compressor and passing. it` into the f in which the turbine system comprises a highpressure turbine and a low-pressure turbine, and

a combustion heating means provided with.

means to heat the working gas passing from the turbo-compressor to the high-pressure turbine and to heat thev working gas passing from the v high-pressure turbine to the low-pressure turbine.

4. A gas turbine plantvwhich comprises a compressor for compressing a working'gas, a gas heater, means for passing the compressed working gas from the compressor for heat exchange contact into the gasheater to increase the temperature of the compressed working gas, a turbine system,A means for passing the compressed heated working gas into the turbine system f wherein it expands, means for returning working gas'expanded in the turbine system into the said compressor, an auxiliary compressor arranged to compress air and pass it into-the said compressor,l meansr for driving the auxiliary compressor, and a conduit for passing a part of the working gas expanded in the turbine system into the gas heater'to serve as combustion air.V

2. Awgas :turbine plant according to claim` 1 a which comprises a heat exchanger arranged to cool Vthe Aworking gas passing'from the' turbine system through the `pipe to thevturbo-compressor and toheat the working gas passing through -theaconduit from the turbo-,compressor to the turbine system. l i

3. A.gas turbine plant according` to" claim l 5. Agas turbine plant according to claim 4 which comprises a circuit conduit system through which theworkinggas ilows in a working cycle and above atmospheric pressure from the compressor to the gas heater,V to Vthe high-pressure turbine and back to the compressory and` a heat exchanger through whichthe working gas passing from the compressor to the gas heater passes in 4heat-exchange relation to the 'working gas passing from the high-pressure turbine back 4 to the compressor.

., gases and the working gas pass in heat exchange relation.

, y WALTER TRAUPEL 

